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Summary: Inherited Constants | Fields | Ctors | Methods | Inherited Methods

# LinkProperties

`public final class LinkProperties`
`extends Object` `implements Parcelable`

java.lang.Object
↳ | android.net.LinkProperties

Describes the properties of a network link. A link represents a connection to a network. It may have multiple addresses and multiple gateways, multiple dns servers but only one http proxy and one network interface. Note that this is just a holder of data. Modifying it does not affect live networks.

## Summary

### Inherited constants
From interface `android.os.Parcelable`
`int` | `CONTENTS_FILE_DESCRIPTOR` Descriptor bit used with `describeContents()`: indicates that the Parcelable object's flattened representation includes a file descriptor.
`int` | `PARCELABLE_WRITE_RETURN_VALUE` Flag for use with `writeToParcel(Parcel, int)`: the object being written is a return value, that is the result of a function such as "`Parcelable someFunction()`", "`void someFunction(out Parcelable)`", or "`void someFunction(inout Parcelable)`".

### Fields
`public static final Creator<LinkProperties>` | `CREATOR` Implement the Parcelable interface.

### Public constructors
`LinkProperties()` Constructs a new `LinkProperties` with default values.

### Public methods
`boolean` | `addRoute(RouteInfo route)` Adds a `RouteInfo` to this `LinkProperties`, if a `RouteInfo` with the same `RouteInfo.RouteKey` with different properties (e.g., different MTU), it will be updated.
`void` | `clear()` Clears this object to its initial state.
`int` | `describeContents()` Implement the Parcelable interface
`boolean` | `equals(Object obj)` Compares this `LinkProperties` instance against the target LinkProperties in `obj`.
`Inet4Address` | `getDhcpServerAddress()` Get DHCP server address
`List<InetAddress>` | `getDnsServers()` Returns all the `InetAddress` for DNS servers on this link.
`String` | `getDomains()` Get the DNS domains search path set for this link.
`ProxyInfo` | `getHttpProxy()` Gets the recommended `ProxyInfo` (or `null`) set on this link.
`String` | `getInterfaceName()` Gets the interface name for this link.
`List<LinkAddress>` | `getLinkAddresses()` Returns all the `LinkAddress` on this link.
`int` | `getMtu()` Gets any non-default MTU size set for this link.
`IpPrefix` | `getNat64Prefix()` Returns the NAT64 prefix in use on this link, if any.
`String` | `getPrivateDnsServerName()` Returns the private DNS server name that is in use.
`List<RouteInfo>` | `getRoutes()` Returns all the `RouteInfo` set on this link.
`int` | `hashCode()` Generate hashcode based on significant fields Equal objects must produce the same hash code, while unequal objects may have the same hash codes.
`boolean` | `isPrivateDnsActive()` Returns whether private DNS is currently in use on this network.
`boolean` | `isWakeOnLanSupported()` Returns whether the network interface supports WakeOnLAN
`void` | `setDhcpServerAddress(Inet4Address serverAddress)` Set DHCP server address.
`void` | `setDnsServers(Collection<InetAddress> dnsServers)` Replaces the DNS servers in this `LinkProperties` with the given `Collection` of `InetAddress` objects.
`void` | `setDomains(String domains)` Sets the DNS domain search path used on this link.
`void` | `setHttpProxy(ProxyInfo proxy)` Sets the recommended `ProxyInfo` to use on this link, or `null` for none.
`void` | `setInterfaceName(String iface)` Sets the interface name for this link.
`void` | `setLinkAddresses(Collection<LinkAddress> addresses)` Replaces the `LinkAddress` in this `LinkProperties` with the given `Collection` of `LinkAddress`.
`void` | `setMtu(int mtu)` Sets the Maximum Transmission Unit size to use on this link.
`void` | `setNat64Prefix(IpPrefix prefix)` Sets the NAT64 prefix in use on this link.
`String` | `toString()` Returns a string representation of the object.
`void` | `writeToParcel(Parcel dest, int flags)` Implement the Parcelable interface.

### Inherited methods
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.
From interface `android.os.Parcelable`
`abstract int` | `describeContents()` Describe the kinds of special objects contained in this Parcelable instance's marshaled representation.
`abstract void` | `writeToParcel(Parcel dest, int flags)` Flatten this object in to a Parcel.

## Fields

### CREATOR

    public static final Creator<LinkProperties> CREATOR

Implement the Parcelable interface.

## Public constructors

### LinkProperties

    public LinkProperties ()

Constructs a new `LinkProperties` with default values.

## Public methods

### addRoute

    public boolean addRoute (RouteInfo route)

Adds a `RouteInfo` to this `LinkProperties`, if a `RouteInfo` with the same `RouteInfo.RouteKey` with different properties (e.g., different MTU), it will be updated. If the `RouteInfo` had an interface name set and that differs from the interface set for this `LinkProperties` an `IllegalArgumentException` will be thrown. The proper course is to add either un-named or properly named `RouteInfo`.

Parameters
`route` | `RouteInfo`: A `RouteInfo` to add to this object. This value cannot be `null`.

Returns
`boolean` | `true` was added or updated, false otherwise.

### clear

    public void clear ()

Clears this object to its initial state.

### describeContents

    public int describeContents ()

Implement the Parcelable interface

Returns
`int` | a bitmask indicating the set of special object types marshaled by this Parcelable object instance. Value is either `0` or `CONTENTS_FILE_DESCRIPTOR`

### equals

    public boolean equals (Object obj)

Compares this `LinkProperties` instance against the target LinkProperties in `obj`. Two LinkPropertieses are equal if all their fields are equal in values. For collection fields, such as mDnses, containsAll() is used to check if two collections contains the same elements, independent of order. There are two thoughts regarding containsAll() 1. Duplicated elements. eg, (A, B, B) and (A, A, B) are equal. 2. Worst case performance is O(n^2).

Parameters
`obj` | `Object`: the object to be tested for equality.

Returns
`boolean` | `true` if both objects are equal, `false` otherwise.

### getDhcpServerAddress

    public Inet4Address getDhcpServerAddress ()

Get DHCP server address

Returns
`Inet4Address` | The current DHCP server address. This value may be `null`.

### getDnsServers

    public List<InetAddress> getDnsServers ()

Returns all the `InetAddress` for DNS servers on this link.

Returns
`List<InetAddress>` | An unmodifiable `List` of `InetAddress` for DNS servers on this link. This value cannot be `null`.

### getDomains

    public String getDomains ()

Get the DNS domains search path set for this link. May be `null` if not set.

Returns
`String` | A `String` containing the comma separated domains to search when resolving host names on this link or `null`.

### getHttpProxy

    public ProxyInfo getHttpProxy ()

Gets the recommended `ProxyInfo` (or `null`) set on this link.

Returns
`ProxyInfo` | The `ProxyInfo` set on this link or `null`.

### getInterfaceName

    public String getInterfaceName ()

Gets the interface name for this link. May be `null` if not set.

Returns
`String` | The interface name set for this link or `null`.

### getLinkAddresses

    public List<LinkAddress> getLinkAddresses ()

Returns all the `LinkAddress` on this link. Typically a link will have one IPv4 address and one or more IPv6 addresses.

Returns
`List<LinkAddress>` | An unmodifiable `List` of `LinkAddress` for this link. This value cannot be `null`.

### getMtu

    public int getMtu ()

Gets any non-default MTU size set for this link. Note that if the default is being used this will return 0.

Returns
`int` | The mtu value set for this link.

### getNat64Prefix

    public IpPrefix getNat64Prefix ()

Returns the NAT64 prefix in use on this link, if any.

Returns
`IpPrefix` | the NAT64 prefix or `null`.

### getPrivateDnsServerName

    public String getPrivateDnsServerName ()

Returns the private DNS server name that is in use. If not `null`, private DNS is in strict mode. In this mode, applications should ensure that all DNS queries are encrypted and sent to this hostname and that queries are only sent if the hostname's certificate is valid. If `null` and `isPrivateDnsActive()` is `true`, private DNS is in opportunistic mode, and applications should ensure that DNS queries are encrypted and sent to a DNS server returned by `getDnsServers()`. System DNS will handle each of these cases correctly, but applications implementing their own DNS lookups must make sure to follow these requirements.

Returns
`String` | The private DNS server name.

### getRoutes

    public List<RouteInfo> getRoutes ()

Returns all the `RouteInfo` set on this link.

Returns
`List<RouteInfo>` | An unmodifiable `List` of `RouteInfo` for this link. This value cannot be `null`.

### hashCode

    public int hashCode ()

Generate hashcode based on significant fields Equal objects must produce the same hash code, while unequal objects may have the same hash codes.

Returns
`int` | a hash code value for this object.

### isPrivateDnsActive

    public boolean isPrivateDnsActive ()

Returns whether private DNS is currently in use on this network. When private DNS is in use, applications must not send unencrypted DNS queries as doing so could reveal private user information. Furthermore, if private DNS is in use and `getPrivateDnsServerName()` is not `null`, DNS queries must be sent to the specified DNS server.

Returns
`boolean` | `true` if private DNS is in use, `false` otherwise.

### isWakeOnLanSupported

    public boolean isWakeOnLanSupported ()

Returns whether the network interface supports WakeOnLAN

Returns
`boolean` | `true` if interface supports WakeOnLAN, `false` otherwise.

### setDhcpServerAddress

    public void setDhcpServerAddress (Inet4Address serverAddress)

Set DHCP server address.

Parameters
`serverAddress` | `Inet4Address`: the server address to set. This value may be `null`.

### setDnsServers

    public void setDnsServers (Collection<InetAddress> dnsServers)

Replaces the DNS servers in this `LinkProperties` with the given `Collection` of `InetAddress` objects.

Parameters
`dnsServers` | `Collection`: The `Collection` of DNS servers to set in this object. This value cannot be `null`.

### setDomains

    public void setDomains (String domains)

Sets the DNS domain search path used on this link.

Parameters
`domains` | `String`: A `String` listing in priority order the comma separated domains to search when resolving host names on this link. This value may be `null`.

### setHttpProxy

    public void setHttpProxy (ProxyInfo proxy)

Sets the recommended `ProxyInfo` to use on this link, or `null` for none. Note that Http Proxies are only a hint - the system recommends their use, but it does not enforce it and applications may ignore them.

Parameters
`proxy` | `ProxyInfo`: A `ProxyInfo` defining the HTTP Proxy to use on this link. This value may be `null`.

### setInterfaceName

    public void setInterfaceName (String iface)

Sets the interface name for this link. All `RouteInfo` already set for this will have their interface changed to match this new value.

Parameters
`iface` | `String`: The name of the network interface used for this link. This value may be `null`.

### setLinkAddresses

    public void setLinkAddresses (Collection<LinkAddress> addresses)

Replaces the `LinkAddress` in this `LinkProperties` with the given `Collection` of `LinkAddress`.

Parameters
`addresses` | `Collection`: The `Collection` of `LinkAddress` to set in this object. This value cannot be `null`.

### setMtu

    public void setMtu (int mtu)

Sets the Maximum Transmission Unit size to use on this link. This should not be used unless the system default (1500) is incorrect. Values less than 68 or greater than 10000 will be ignored.

Parameters
`mtu` | `int`: The MTU to use for this link.

### setNat64Prefix

    public void setNat64Prefix (IpPrefix prefix)

Sets the NAT64 prefix in use on this link. Currently, only 96-bit prefixes (i.e., where the 32-bit IPv4 address is at the end of the 128-bit IPv6 address) are supported or `null` for no prefix.

Parameters
`prefix` | `IpPrefix`: the NAT64 prefix. This value may be `null`.

### toString

    public String toString ()

Returns a string representation of the object. In general, the `toString` method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.

The `toString` method for class `Object` returns a string consisting of the name of the class of which the object is an instance, the at-sign character ``@`', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:

>      getClass().getName() + '@' + Integer.toHexString(hashCode())

Returns
`String` | a string representation of the object.

### writeToParcel

    public void writeToParcel (Parcel dest,
                    int flags)

Implement the Parcelable interface.

Parameters
`dest` | `Parcel`: The Parcel in which the object should be written.
`flags` | `int`: Additional flags about how the object should be written. May be 0 or `Parcelable.PARCELABLE_WRITE_RETURN_VALUE`. Value is either `0` or a combination of `Parcelable.PARCELABLE_WRITE_RETURN_VALUE`, and android.os.Parcelable.PARCELABLE_ELIDE_DUPLICATES

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